Safety mechanism for elevators



W. H. BOZE SAFETY MECHANISM FOR ELEVATORS May 27 1924.

Filed June 4. 1923 2 Sheets-Sheet 1 May 27 1924. 1,495,242

' w. H. BozE SAFETY MECHANISM FOR ELEVATORS Filed we 4. 192; 2 Sheets-Sheet 2 Patented May 27, 1924.

WYTH HOWARD BOZE, OF WENDELL, NORTH CAROLINA.

SAFETY MECHANISM FOR ELEVATORS.

' Application filed June 4,

To aZZ whom it may concern:

Be it known that WYTH H. BOZE, a citizenof the United States, residing at Wendell, in the county of Wake and State of North Carolina, has invented certain new and useful Improvements in Safety Mechanism for Elevators, of which the following is a specification.

In carrying out the present invention, it is my purpose to provide a safety mechanism for elevators that includes a locking means for the elevators that is automatically actuated in the opening of the elevator doors for thereby preventing movement of the elevators when the doors are open, and consequently preventing accident.

The primary object of this invention resides in the provision of such a safety mechanism for elevators that is extremely simple of construction and efficient in operation, and one that may be readily applied to practically all types of elevators with which I am now familiar, and this at a minimum expenditure.

The nature and advantages of the invention will be better understood when the following detailed description is read in connection with the accompanying drawings, the invention residing in the construction, combination, and arrangement of parts as claimed.

In the drawings forming part of this application, like numerals of reference indicate similar parts in the several views, and wherein:

Figure 1 is a front elevation of an elevator car and the usual guide bars of the elevator equipped with my improved safety mechanism, a portion of said car and guide bars being broken away.

Figure 2 is an enlarged fragmentary detailed cross-section through a portion of the elevator car and guide bar showing a portion of my safety mechanism in top plan, and

Figure 3 is a fragmentary side elevation thereof.

Referring to the drawings in detail, 5 indicates an elevator car movable between the usual side guide bars 6. In this instance the car 5 is provided with an entrance and exit opening 7 adjacent one side thereof adapted to be closed by a desirable form of sliding door 8.

Upon the guide bar 6 adjacent the side of the car that is formed with the door open- 1923. Serial No. 643,270.

ing 7 is a rocking lever 9 pivotly secured adjacent its upper end to a bracket 10 carried by said guide bar 6. The upper end of this rocking lever 9 carries an inwardly" a spring 12 is provided that surrounds the pin 11 between the guide bar and the end of said rocking lever. Loosely pivotly connected to the lever 9 beneath its pivot point is an inwardly extending pin 13 that has sliding movement within an opening in said bar 6 and is adapted for engaging within an opening 14: in the adjacent side wall of the car 5 when this opening comes into alignment with the pin. The inner end of this pin 13 is suitably beveled for permitting the ends of the car to pass thereby during its upward and downward movement between the guide bars 6.

This rocking lever 9 is formed at its lower end with a forwardly extending arm 15, the end of which has contact with one end of a pin 16 slidable within an opening in a bar 17 that constitutes a part of the guiding mechanism of the car 5. The inner end of this opening is flared outwardly, as shown more clearly in Figure 1, and is adapted for receiving the pointed projection 8 on one of the vertical edges of the car door 8 when the same is closed whereby the said pin 16 will be forced outwardly for consequently rocking the lever 9 upon its pivot for thereby releasing the pin 13 from the opening 1 1 in the said side wall of the car 5.

J ournaled within bearings 18 upon the outer side of the opposite guide bar 6 is a shaft 19 that carries adjacent its upper end 'a spur gear 20 that has mesh with the racked surface 21 of a relatively long pin 22. This pin is slidably disposed within an opening of the said bar 6 and is beveled at its inner end, and is adapted for engagement within an opening 23 in the opposite side wall of the car 5 when the door 8 is opened. Keyed to the lower end of this shaft 19 is a spur gear 24 that is adapted to be engaged by a rack bar 25 upon the end of an inward extension 26 of a longitudinal bar 27. This longitudinal bar 27 is rigidly connected to the adjacent edge of the car door 8 and has movement through a bearing 28 carried by said car.

In view of the above .description, it will at once be apparent that when the car 5 is positioned as shown in the figures, this position being at one of the floor landings, upon an opening of the door 8 the shaft 19 will be rotated in one direction for forcing the pin 22 into the opening 23 of the car. Also, when the door is opened the pin 13 will be engaged Within the opening 14 upon the opposite side of the car under the influence of the spring 12. A closing of said door 8 will obviously occasion the withdrawal of the pins 13 and 22 for permitting of the movement in opposite directions of the car between the guide bars 6.

Numerous advantages of a safety mechanism for elevators of this type will be at onceappreciated by those skilled in the art, and even though I have herein set forth the most practical embodiment of this invention, it is, nevertheless, to be understood that messes minor changes may be made therein without departing from the spirit and scope of the invention as claimed.

Having thus described my invention, What I claim as new, and desire to secure by Letters Patent, is:

In combination with an elevator, pinsslidable Within openings in the elevator guide bars and adapted to engage in openings in the opposite side walls of the elevator car when the door of the car is opened, means between the door member and one of said pins for moving said pin inwardly of the opening of the adjacent side wall of the car when the door is opened, and means for automatically engaging the other of said pins into the other of said openings in the car as the door is opened.

In testimony whereof I afix my signature.

WY'II-I HQWARD BOZE. 

